AT89S8253-24PI Equivalent & Substitute Parts

Part Overview

The AT89S8253-24PI is an 8-bit microcontroller from Microchip Technology's 89S series, featuring 12KB of FLASH program memory, 2KB EEPROM, and 256 bytes of RAM. This device operates at 24MHz with a supply voltage range of 2.7V to 5.5V and includes integrated peripherals such as Power-On Reset (POR), Watchdog Timer (WDT), SPI, and UART/USART connectivity. The AT89S8253-24PI is classified as obsolete, making equivalent substitute parts necessary for new designs and ongoing production requirements.

Substiute Parts

AT89S8253-24PI

Microchip TechnologyIn Stock: 1990AT89S8253-24PI Datasheet

Current PartRFQ

AT89S8253-24PU

Microchip TechnologyIn Stock: 5635AT89S8253-24PU Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the AT89S8253-24PI is determined by strict equivalence across the following critical parameters:

• Core Processor Architecture: 8051-compatible instruction set
• Memory Configuration: 12KB FLASH program memory, 2KB EEPROM, 256 bytes RAM
• Operating Frequency: 24MHz
• Supply Voltage Range: 2.7V ~ 5.5V
• I/O Count: 32 pins
• Peripheral Set: SPI, UART/USART, POR, WDT
• Package Type: 40-DIP through-hole form factor
• Temperature Range: -40°C ~ 85°C

The AT89S8253-24PU meets all these criteria and is classified as a direct substitute. Both parts share identical electrical specifications, memory architecture, and pinout configuration. The primary difference is packaging format and product status.

Parameter Comparison

Engineering Selection Recommendations

The AT89S8253-24PU is the direct functional equivalent of the AT89S8253-24PI. Both devices are electrically and mechanically identical with respect to all specified parameters. The AT89S8253-24PU is preferred for new designs and production applications due to its active product status and ROHS3 compliance. The AT89S8253-24PI, classified as obsolete, should be replaced with the AT89S8253-24PU in all new applications. Both parts are supplied by Microchip Technology and maintain identical pinout, memory architecture, and operational characteristics.

Frequently Asked Questions (FAQ)

Q: Can the AT89S8253-24PU directly replace the AT89S8253-24PI in existing designs?

A: Yes. Both parts share identical electrical specifications, pinout, memory configuration, and operating parameters. No circuit modifications are required for substitution.

Q: What is the difference between the AT89S8253-24PI and AT89S8253-24PU?

A: The primary differences are product status and compliance certification. The AT89S8253-24PI is obsolete and RoHS non-compliant. The AT89S8253-24PU is active and ROHS3 compliant. Electrically and mechanically, both devices are equivalent.

Q: Are there packaging differences between these parts?

A: Both parts use the same 40-DIP through-hole package with 0.600" (15.24mm) body width. The AT89S8253-24PI is supplied in standard packaging, while the AT89S8253-24PU is supplied in tube packaging. This does not affect electrical or mechanical compatibility.

Q: What supply voltage range do these microcontrollers support?

A: Both the AT89S8253-24PI and AT89S8253-24PU operate across a supply voltage range of 2.7V to 5.5V, allowing operation in both 3.3V and 5V systems.

Q: What is the memory configuration of these devices?

A: Both devices feature 12KB of FLASH program memory, 2KB of EEPROM, and 256 bytes of internal RAM. This configuration is identical across both part numbers.

Q: Are these devices suitable for industrial temperature applications?

A: Both the AT89S8253-24PI and AT89S8253-24PU operate across the temperature range of -40°C to 85°C (TA), making them suitable for industrial applications within this specification.